twitter-bootstrap关闭警报不工作

我无法让它工作。当我点击关闭按钮时，没有任何反应。

I can't get it to work. When I click the close button, nothing happens.

这里是代码：

 <div class=" alert alert-error alert-block" style="width:200px" >
    <button class="close" data-dismiss="alert">&times;</button>
        <span>errors</span>            
    </div>

我在jsfiddler上复制了这个问题：http://jsfiddle.net/graphicsxp/7L7Nd/

I've reproduced the issue on jsfiddler: http://jsfiddle.net/graphicsxp/7L7Nd/

EDIT

@using (Html.BeginForm(null, null, FormMethod.Post, new { id = "quoteWizard" }))
{
    <input type="hidden" id="ModelType" value="CarQuoteRequestViewModel" />


    ViewBag.ValidationSummaryClass = ViewData.ModelState.IsValid ? "validation-summary-valid" : "validation-summary-errors";

    <div class="@ViewBag.ValidationSummaryClass alert alert-error in fade" data-valmsg-summary="true">
    <button class="close" data-dismiss="alert">&times;</button>
        <span>Before you can continue, please make sure you have completed the mandatory fields
            highlighted below.</span>
        <ul style="display: none" />
    </div>



    @RenderSection("QuoteSection")

    <div class="ui-formwizard-nav">
        <input id="back" value="@Resource.Global.Previous" type="reset" class="btn btn-primary" />
        <input id="next" value="@Resource.Global.Next" class="btn btn-primary" type="submit" />
    </div>
}